YOU SAID:

i haven't seen you in such a long time

INTO JAPANESE

こんなに長い間あなたに会っていません

BACK INTO ENGLISH

I haven't seen you for such a long time

INTO JAPANESE

そんなに長いこと会ってないよ

BACK INTO ENGLISH

I haven't seen you for such a long time.

INTO JAPANESE

そんなに長い間会っていません。

BACK INTO ENGLISH

We haven't seen each other for such a long time.

INTO JAPANESE

私たちはそんなに長い間会っていません。

BACK INTO ENGLISH

We haven't met for that long.

INTO JAPANESE

私たちはそんなに長い間会っていません。

BACK INTO ENGLISH

We haven't met for that long.